Replacing Quantum Feedback with Open-Loop Control and Quantum Filtering
arXiv:0908.0198 · doi:10.1103/PhysRevA.81.020301
Abstract
Feedback control protocols can stabilize and enhance the operation of quantum devices, however, unavoidable delays in the feedback loop adversely affect their performance. We introduce a quantum control methodology, combining open-loop control with quantum filtering, which is not constrained by feedback delays. For the problems studied (rapid purification and rapid measurement) we analytically derive lower bounds on the control performance that are comparable with the best corresponding bounds for feedback protocols.
5 pages, revtex4, 3 eps figures. Comments welcome. V2 minor corrections, published version.
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- Rapid purification of quantum systems by measuring in a feedback-controlled unbiased basis
- Quantum State Discrimination Using the Minimum Average Number of Copies
- Qubit purification speed-up for three complementary continuous measurements
- Delayed feedback control in quantum transport
- Continuous Quantum Error Correction Through Local Operations
- Maximum information gain in weak or continuous measurements of qudits: complementarity is not enough
- Global versus local optimality in feedback-controlled qubit purification: new insights from minimizing Rényi entropies
- Simultaneous Measurements of Noncommuting Observables. Positive Transformations and Instrumental Lie Groups
- Rapid readout of a register of qubits using open loop quantum control
- Efficient progressive readout of a register of (qu)bits
- Quantum feedback for measurement and control